Every little but helps and it is very time consuming to floss with braces on. I have received great feedback from hygienist of referring dentists, so I purchased an air floss unit for myself.
After one week of use, I give it an enthusiastic thumbs up! Technique is important and the tip should be aimed directly between the teeth and gum line. I use mouthwash rather than water and peroxide can be substituted as well.
You can purchase the Sonicare Air Floss online at sonicare.com or Amazon. If you go on Sonicare.com they are offering a coupon for $15 off http://philips.to/U7mPDL.
It is definitely worth the investment. Especially if you or your child have braces.
Dr. David McSurdy